Difference between revisions of "Setting up Samba as a Print Server"

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'''This HowTo is valid for Samba 3 and 4 print server installations.'''
 
'''This HowTo is valid for Samba 3 and 4 print server installations.'''
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== Some definitions ==
 
== Some definitions ==
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; Printer forms : Windows is already shipped with an amount of forms, that define the typical paper sizes. If a form isn't known to the print server, the client cannot use this, although the printer is able to do it.
 
; Printer forms : Windows is already shipped with an amount of forms, that define the typical paper sizes. If a form isn't known to the print server, the client cannot use this, although the printer is able to do it.
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== Driver models ==
 
== Driver models ==
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* Save the newly added printer.
 
* Save the newly added printer.
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== LPD ==
 
== LPD ==
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spoolssd is still a new feature. If you encounter any bug, please report it at [https://bugzilla.samba.org/ https://bugzilla.samba.org/], to get it fixed as soon as possible.
 
spoolssd is still a new feature. If you encounter any bug, please report it at [https://bugzilla.samba.org/ https://bugzilla.samba.org/], to get it fixed as soon as possible.
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=== Granting print operator privileges ===
 
=== Granting print operator privileges ===
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  # net rpc rights list accounts -Uadministrator
 
  # net rpc rights list accounts -Uadministrator
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=== Setup the [printers] share ===
 
=== Setup the [printers] share ===
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  # mkdir -p /var/spool/samba/
 
  # mkdir -p /var/spool/samba/
 
  # chmod 1777 /var/spool/samba/
 
  # chmod 1777 /var/spool/samba/
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=== Setup the [print$] share ===
 
=== Setup the [print$] share ===
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  # chgrp -R „SAMDOM\Domain Admins“ /srv/samba/Printer_drivers/
 
  # chgrp -R „SAMDOM\Domain Admins“ /srv/samba/Printer_drivers/
 
  # chmod -R 2755 /srv/samba/Printer_drivers/
 
  # chmod -R 2755 /srv/samba/Printer_drivers/
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== Sharing a printer with Samba ==
 
== Sharing a printer with Samba ==
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  # smbcontrol all reload-config
 
  # smbcontrol all reload-config
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----
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[[Category:Configuration]]
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[[Category:Printing]]

Revision as of 23:24, 5 September 2015

General

Introduction

This HowTo will provide you with an easy guide to setup Samba, to act as a Windows print server including Point'n'Click printer driver installation for users.

This HowTo is valid for Samba 3 and 4 print server installations.


Some definitions

Printer share 
Each printer is shared by a name. During the printing process, the client sends the printjob to it.
Print server backend 
Samba can use e. g. CUPS, LPD/Lprng and others as backend. The print server forwards the job to local or network printers.
Windows printer driver 
A piece of software that converts the printed data to a printer specific form. The driver for each shared printer can be preconfigured with default values.
Point'n'Print 
Windows 2000 and later support the ability to automatically download, install and preconfigure drivers from the server when connecting a printer. The installation can be carried out by ordinary users without special permissions.
Printer forms 
Windows is already shipped with an amount of forms, that define the typical paper sizes. If a form isn't known to the print server, the client cannot use this, although the printer is able to do it.


Driver models

Supported by Samba: Printer driver version 3 (Windows 2000 to Windows 8)

Currently not supported by Samba: Printer driver version 4 (Windows 8)



Print server backend

The following sub-chapters will give you a short overview on possible backends, including adding a new network printer, we'll use in our later examples for sharing it by Samba.

The examples setup a RAW printer (content is send directly to the device). We don't use filters or drivers on the backend, because a RAW printer allows us to render the output on the workstation and use the printer specific driver.

We assume here, that you have the print server backend already basically configured and it's running, so printers can be added next.


CUPS

CUPS is currently the most widely used spool system in *nix environments and shipped with most distributions. Samba has built-in support and defaults to CUPS if the development package (aka header files and libraries) could be found at compile time.

Basically all sorts of files can be printed with CUPS, but using a Postscript or a RAW printer driver will give you the most benefit in combination with the Windows printer driver, because then all settings can be controlled on the Windows client.


Adding a new printer

  • On the „Administration“ tab click the „Add Printer“ button.
  • Choose the way that your printer is connected and enter the appropriate URL.

Examples:

# LPD protocol
lpd://hostname/queue

# Internet Printing Protocol
ipp://hostname/ipp/port

# Forwarding the jobs to a Windows print server.
# Hint: Vista and higher, don't allow anonymous connects by default, so you must provide a username and password.
smb://username:password@domain/servername/printername 
  • Enter a name for the printer
  • When you reach the step to choose the vendor and model, choose „Raw“ for both, because the rendering will be done later by the Windows driver.
  • Save the newly added printer.


LPD

This was the first widely used printing system and still runs on many servers. It is very simple to install and configure. There are different implementations of LPD servers, like the often used LPRng.


Adding a new printer

  • To add a new network printer, you simply need to add the following line to your 'printcap' (typically '/etc/printcap'). For the different options used in the example, see 'man printcap'.
PRINTERNAME:sd=/path/to/spool/directory:sh:mx=0:mc=0:rm=IP_or_DNS_Name
  • After adding the new printer entry, run the following command to create the LPD spool directory and restart/reload the service, to take the changes affect.
# checkpc -f
# service lpd restart
  • The following command allows you query the state of the printer:
# lpq -P PRINTERNAME
Printer: PRINTERNAME@SAMPRINTSERVER (dest PRINTERNAME@IP_or_DNS_Name)
 Queue: no printable jobs in queue
Ready

no entries



Configuring Samba as print server

General

Enabling spoolssd (optional)

Note: Some features of spoolssd were broken before 4.0.17 and 4.1.7. That's why it is recommended to use at least these versions!

spoolssd is a feature, introduced in Samba 4.0, that increases printer performance. In the past, when a print job came in, a smbd child process was forked, to initialize the printcap cache, spoolss, etc. If you have a huge printcap cache and it needs to be updated first, the client could hang for several seconds.

Since Samba 4, you can configure spoolssd to be started as forked processes. If enabled, you'll see additional smbd processes, which will handle only spoolss requests. The master process is a simple daemon with a small memory footprint, that only forks and kills childs serving the spoolss pipe. When a connection comes in, it can directly start to talk to the daemon and ask for information about the printer without any delay, this gives a performance improvement.

To enable spoolssd, add the following to the [global] section of your smb.conf:

rpc_server:spoolss = external
rpc_daemon:spoolssd = fork

After you have restarted Samba, you will discover additional smbd processes that handle spoolss requests:

With spoolssd enabled after startup:       With spoolssd disabled (default):
30903 smbd                                 30955 smbd
30912  \_ smbd                             30963  \_ smbd
30913      \_ smbd
30914      \_ smbd
30915      \_ smbd
30916      \_ smbd
30917      \_ smbd
30918      \_ smbd
30920      \_ smbd
30921      \_ smbd
30922      \_ smbd
30923      \_ smbd
30924      \_ smbd

You can adjust the daemons behaviour through the following parameters (the values in the examples are the defaults):

spoolssd:prefork_min_children = 5           # Minimum number of child processes
spoolssd:prefork_max_children = 25          # Maximum number of child processes
spoolssd:prefork_spawn_rate = 5             # Start (fork) x new childs if one connection comes in (up to prefork_max_children)
spoolssd:prefork_max_allowed_clients = 100  # Number of clients, a child process should be responsible for
spoolssd:prefork_child_min_life = 60        # Minimum lifetime of a child process (60 seconds
                                            # is the minimum, even a lower value has been configured)

spoolssd is still a new feature. If you encounter any bug, please report it at https://bugzilla.samba.org/, to get it fixed as soon as possible.


Granting print operator privileges

Users or groups, who should be able to administrate printers on your server, have to be granted the „SePrintOperatorPrivilege“ privilege. This is required on member servers, as they have their own, local SAM database. It is recommended to grant it to a domain group, because changes can be done quick and easily with the typical user management tools like ADUC.

The following example grants the privilege to the domain group „Domain Admins“:

# net rpc rights grant 'SAMDOM\Domain Admins' SePrintOperatorPrivilege -Uadministrator

Existing privileges can be reviewed with

# net rpc rights list accounts -Uadministrator


Setup the [printers] share

This share defines general information about your printing backend. See the „[printers]“ section in the man page for additional information.

  • Add the new section to your smb.conf
[printers]
     path = /var/spool/samba
     printable = yes
     printing = CUPS|LPRNG|...
  • If you choose CUPS as backend, make sure that your smbd is compiled with CUPS support:
# smbd -b | grep CUPS
   HAVE_CUPS_CUPS_H
   HAVE_CUPS_LANGUAGE_H
   HAVE_CUPS
   HAVE_LIBCUPS

If you don't get any output, make sure that the CUPS header files and libraries are installed and recompile Samba with --with-cups.

  • The next step is to create the samba spool directory, defined in the „[printer]“ share. Set the appropriate permissions, depending on your needs.
# mkdir -p /var/spool/samba/
# chmod 1777 /var/spool/samba/


Setup the [print$] share

To enable Point'n'Print support, a share named „print$“ must exist. This share name is hardcoded in Windows clients and can't be altered.

  • Add the share to your smb.conf
[print$]
     path = /srv/samba/Printer_drivers
     comment = Printer Drivers
     writeable = yes
  • Create the folder that will later contain the drivers:
# mkdir -p /srv/samba/Printer_drivers/
  • Next we create the required directory structure for the print$ share (newer versions of Samba will create it on the fly):
BASEDIR=/srv/samba/Printer_drivers
for i in COLOR IA64 W32ALPHA W32MIPS W32PPC W32X86/{2,3} WIN40 x64; do 
     mkdir -p $BASEDIR/$i;
done
  • Finally, set the permissions. It is recommended that normal users just have read-only access to the share, while the group you have granted print operator privileges to, has write permissions to upload printer drivers. The following examples are granting write permissions to the „Domain Admins“ group.
  • If you're running Samba 4 and later, you are having the choice to use POSIX or Windows ACLs on the print$ share. The benefit of Windows ACLs are, that you can use the full Windows ACLs set. Have a look at the Setup and configure file shares documentation for further details. The suggested filesystem permissions for Windows ACLs on the print$ share are:
  • Creator Owner: Full control (Subfolders and files only)
  • Authenticated Users: Read & execute, List folder contents, Read (This folder, subfolders and files)
  • System: Full control (This folder, subfolders and files)
  • Domain Admins: Full control (This folder, subfolders and files)
  • ACL example for POSIX ACLs on the print$ share (e. g. for Samba 3.x)
# chgrp -R „SAMDOM\Domain Admins“ /srv/samba/Printer_drivers/
# chmod -R 2755 /srv/samba/Printer_drivers/


Sharing a printer with Samba

  • For each printer you want to share via Samba, you have to create a separate share (unless you have "load printers = yes" defined in your smb.conf). The following is an example:
[MyDemoPrinter]
     path = /var/spool/samba/
     browseable = yes
     printable = yes
     printer name = Printername_in_backend
  • Set the „printer name“ parameter to the name of your corresponding CUPS/LPD/... queue.
  • To bring the changes live, reload the Samba configuration:
# smbcontrol all reload-config